Question

Va rog ajutati ma la 8 si 9 dau puncte,coroana si multumesc

Answer 1

a)2x-1∈{1,2,3,4,6,12}
2x∈{2,3,4,5,6,13}
x∈{1,2,}
b) x+3|2x+15
x+3|x+3
X+3|2x+6
x+3|2x+15-2x-6
x+3|9
x+3∈{1,3,9}
x∈{0,6}
9)(a+1)(b+2)=6
a+1∈{1,2,3,6}
b+2∈{6,3,2,1}
a∈{0,1,2}
b∈{4,1,0}
(0,4),(1,1)(2,0}